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Battery charger ICs

BQ24091

ACTIVE

1-cell, 1-A, Li-ion battery charger with 100kΩ NTC

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Data sheet

BQ24091

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 6.45 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 12 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.45 Rating Catalog Operating temperature range (°C) -40 to 150
Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 6.45 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 12 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.45 Rating Catalog Operating temperature range (°C) -40 to 150
HVSSOP (DGQ) 10 14.7 mm² 3 x 4.9
  • Charging
    • 1% charge voltage accuracy
    • 10% charge current accuracy
    • Pin selectable USB 100-mA and 500-mA maximum input current limit
    • Programmable termination and precharge threshold
  • Protection
    • 6.6-V overvoltage protection
    • Input voltage dynamic power management
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection and ISET short detection
    • Operation over JEITA range via battery NTC – ½ fast-charge-current at cold, 4.06 V at hot, BQ092/3
    • Fixed 10-hour safety timer
  • System
    • Automatic Termination and Timer Disable Mode (TTDM) for absent battery pack with thermistor
    • Status indication – charging/done
    • Available in a small 10-pin MSOP package
  • Charging
    • 1% charge voltage accuracy
    • 10% charge current accuracy
    • Pin selectable USB 100-mA and 500-mA maximum input current limit
    • Programmable termination and precharge threshold
  • Protection
    • 6.6-V overvoltage protection
    • Input voltage dynamic power management
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection and ISET short detection
    • Operation over JEITA range via battery NTC – ½ fast-charge-current at cold, 4.06 V at hot, BQ092/3
    • Fixed 10-hour safety timer
  • System
    • Automatic Termination and Timer Disable Mode (TTDM) for absent battery pack with thermistor
    • Status indication – charging/done
    • Available in a small 10-pin MSOP package

The BQ2409x series of devices are highly integrated Li-ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The BQ2409x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor. The fast charge current value is also programmable via an external resistor.

The BQ2409x series of devices are highly integrated Li-ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The BQ2409x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor. The fast charge current value is also programmable via an external resistor.
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Technical documentation

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Type Title Date
* Data sheet BQ2409x 1-A, Single-Input, Single-Cell Li-Ion and Li-Pol Battery Chargers datasheet (Rev. H) 27 Apr 2021
Application note BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions 25 Feb 2019
Application note Building your own Battery Simulator 14 Oct 2013
User guide 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger . 31 Dec 2012
Application note Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio 29 Nov 2012
User guide 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger (Rev. A) 07 Jun 2010

Design & development

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Gerber file

Linear Charger NTC Calculator

SLUC670.ZIP (350 KB)
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Reference designs

TIDA-00043 — 1A Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger Reference Design

This reference design delivers up to 1000 mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for ~540 mA. The USB current limit modes are selected by the ISET2 pin and limits current to a maximum of 500 mA (logic (...)
Test report: PDF
Schematic: PDF
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HVSSOP (DGQ) 10 Ultra Librarian
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